How are blood drops at different heights alike?

Asked By: Timmy Tropko | Last Updated: 8th February, 2020
Category: medical health diabetes
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Different Heights
Usually the first drip is even and splatters with each drop, where as the second is uneven and splattered at the end. They are similar because when the blood first got dropped they stayed in a circle at first.

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Similarly, it is asked, how do large volume and dripped volume blood patterns compare?

Both pattern have a darker and lighter portion, thus showing where the initial impact of the blood was. Both splatters have satellites, however there are bigger sizes and a greater quantity of satellites with the large volume pattern.

Beside above, what are the six types of blood spatter patterns? Types of Stains

  • Gunshot spatter - includes both forward spatter from the exit wound and back spatter from the entrance wound.
  • Cast-off - results when an object swung in an arc flings blood onto nearby surfaces.
  • Arterial spray - refers to the spurt of blood released when a major artery is severed.

Similarly one may ask, how does height relate to blood droplet characteristics?

The height from which the blood falls will affect the size of the stain, with greater heights tending to result in larger bloodstains. This type of bloodstain is the result of a forceful impact between an object and wet blood, causing the blood to break into smaller droplets.

What are the 4 types of passive bloodstains?

  • Passive. a. formed from the force of gravity acting alone. b. subdivided (drops, drip patterns, pools, clots) c. oozing or gushes from the body, dripping finger or arm, drops from a knife.
  • Transfer. a. wet bloody surface comes in contact with a secondary surface. b. wipe, smudge, swipe or smear. c.
  • Projected blood spatter.

39 Related Question Answers Found

What can dried blood tell an expert?

Dry blood samples can detect both antibodies and hepatitis virus RNA successfully. It involves obtaining a few drops of blood by fingerprinting, and letting them dry on a specially specific absorbent paper card.

Is blood spatter analysis accurate?

Bloodstain-pattern analysis has been accepted as reliable evidence by appellate courts in one state after another with little or no examination of its scientific accuracy. When defendants appealed the legitimacy of the experts' testimony, the cases made their way to state appeals courts.

What factors affect blood spatter patterns?

Bloodstain Characteristics
  • Many factors affect the size and shape of the blood drops.
  • In addition to droplet volume, distance of fall and the blood source surface characteristics, other factors affect the size, shape and appearance of the bloodstains.

How does drop height affect splatter diameter?

The first hypothesis that the higher the blood is dropped from, the bigger the spatter it will create is correct. Since there is more time due to the greater height there is more impact from gravity pulling the drop down which makes the drop gather more speed so it hits the surface with more force.

How do you find the angle of blood spatter?


Angle of Impact
  1. Measure the length and width of the splatter.
  2. Divide the width of the splatter by its length.
  3. Determine the arcsin of that number, typically using a calculator with an arcsin function.

Why is it important to know how blood patterns differ?

It is important to know how blood patterns differ on different surfaces that way you can tell how they behave. Blood drips change as the impact angle changes be growing longer and dripping faster if the angle is big. If it is smaller, closer to the ground, then then it wont drip as much.

What two forces does a blood droplet experience as it falls?

Blood forms a spherical shape (perfect circular shape) almost immediately upon separating from the blood source. The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically.

How does blood spatter analysis help solve crimes?

The shape and size of these droplets can help to determine the positioning of a victim, the type of weapon used, and the force used in the crime. On the other hand, blood drip stains appear when only gravity works on the blood.

What is blood made of?

Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.

How do you measure blood drop height?


To determine the height we construct the following, see figure 11. Now we calculate: STEP 1: tan 70 °= X/10 STEP 2: 10(tan 70 °) = 27.5ft. The height at which the blood fell was 27.5 ft.

What are passive drops?

Passive Drop (Bleeding) -- Bloodstain drop(s) created or formed by the force of gravity acting along. Spatter -- That blood which has been dispersed as a result of force applied to a source of blood. Patterns produced are often characteristic of the nature of the forces which created them.

How does surface affect blood spatter?

The texture of the target surface upon which a drop of blood falls affects the size and shape of the bloodstain pattern. Hard, nonporous surfaces will produce circular stain patterns that have smooth edges, but softer, porous surfaces will produce spatter stains that are scalloped or have rough edges.

How does velocity affect blood spatter?

High velocity blood spatter:
The force of the blood hitting a surface for high velocity blood spatter is over 100 feet per second. This causes the pattern of the blood to be similar to a fine spray. Each tiny droplet in a high velocity blood pattern less than 1mm in diameter.

Is it blood spatter or blood splatter?

To spatter means to scatter small particles of a substance. A spatter is the pattern of drops that result from spattering. To splatter means to scatter large particles of a substance. A splatter is the pattern of drops that result from splattering.

What is blood spatter used for?


To help reconstruct events that caused bloodshed, analysts use the direction and angle of the spatter to establish the areas of convergence (the starting point of the bloodshed) and origin (the estimation of where the victim and suspect were in relation to each other when bloodshed occurred).

What is a transfer pattern?

Blood 5: Transfer Bloodstains. Background: A transfer bloodstain is created when a wet, bloody surface comes in contact with a secondary surface. A recognizable image of all, or a portion, of the original surface may be observed in the pattern, as in the case of a bloody hand or footwear.

What are the four stages of blood droplet stain?

Terms in this set (4)
  • Contact/collapse. Droplet hits the object.
  • Displacement. Slight dimples and spines begin to form based on the irregularities on the impact surface.
  • Dispersion. Most of the volume of the blood is forced to the rim.
  • Retraction.